單項(xiàng)選擇題

The rated operating time of a self-contained breathing device may be reduced in actual use because of（）.

A.pressure differences in the atmosphere
B.the length of the hose attached to the facepiece
C.the physical exertion of the person wearing the device
D.spaces containing poisonous vapors

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單項(xiàng)選擇題

The radiotelephone urgency signal is（）.

A.mayday
B.pan pan
C.securite
D.seelonce feenee

單項(xiàng)選擇題

The Muster List (“Station Bill”) shows each person’s lifeboat station，duties during abandonment，basic instructions，and（）.

A.all emergency signals
B.instructions for lowering the lifeboats
C.the time each weekly drill will be held
D.work schedule

The rated operating time of a self-contained breathing device may be reduced in actual use because of（）.

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The radiotelephone urgency signal is（）.

The Muster List (“Station Bill”) shows each person’s lifeboat station，duties during abandonment，basic instructions，and（）.

The Muster List (“Station Bill”) shows each person’s lifeboat station，duties during abandonment，basic instructions，and（）.